Re: Question about support for OpenGL 3.2 Core context

llvmpipe/softpipe support all of 3.3 with one exception which it
fakes: MSAA.  You may be detecting that?

  OG.


On Wed, Dec 9, 2015 at 2:11 AM, Brian Paul <[email protected]> wrote:
> On 12/04/2015 07:10 AM, Ken Martin wrote:
>>
>> Thanks! Seems the system in question was using llvmpipe which passes
>> ~95% of our tests when we tell it be a 3.2 context using the environment
>> variables. For some reason I was thinking llvmpipe was full 3.2 Core.
>
>
> llvmpipe does support OpenGL 3.2 core profile (3.3 actually).
>
> For your users who are having trouble, seeing the output of glxinfo might
> yield a clue.
>
> -Brian
>
>> I
>> tried playing with softpipe to see if that had better results but it had
>> significantly more failures. I think the Intel SWR is at the 99% or so
>> mark now on our tests so that may be a good bet for our pure software
>> rendering.
>>
>> Thanks Again!
>> Ken
>>
>>
>> On Thu, Nov 26, 2015 at 6:41 AM, Albert Freeman
>> <[email protected] <mailto:[email protected]>> wrote:
>>
>>     On 26 November 2015 at 11:37, Albert Freeman
>>     <[email protected] <mailto:[email protected]>> wrote:
>>      > On 25 November 2015 at 22:45, Ken Martin <[email protected]
>>     <mailto:[email protected]>> wrote:
>>      >>
>>      >> Noob question incoming... I have an application that requests a
>>     3.2 core
>>      >> context from Mesa.  I tell folks to make sure they have mesa
>>     version 10.6.5
>>      >> or later which I thought supported OpenGL 3.2.  Usually this
>>     works but now
>>      >> and then I get users who's Mesa (including version 11) fails to
>>     provide a
>>      >> 3.2 Core context. I tell them to set
>>      >>
>>      >> MESA_GL_VERSION_OVERRIDE=3.2
>>      >>
>>      >> and
>>      >>
>>      >> MESA_GLSL_VERSION_OVERRIDE=150 (or something like that)
>>      >>
>>      >> and it generally works. But I'm not sure why the original
>>     request for 3.2
>>      >> Core is failing on some systems (drivers?).  Looking at
>>      >>
>>      >> http://mesamatrix.net/
>>
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__mesamatrix.net_&d=BQMFaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=T0t4QG7chq2ZwJo6wilkFznRSFy-8uDKartPGbomVj8&m=DgUiZLZLE5l5BuSC2NBUMBQS2DGA9QhpHNlB-VsdiFA&s=265u7-eKXnTubRJ-iofPSBX-H-LKHhoyVG6X43hKuqs&e=>
>>      >>
>>      >> leads me to think that all drivers with a recent mesa should be
>>     fine with
>>      >> 3.2 Core but obviously I am missing something. Do I need to be
>>     telling them
>>      >> to use a specific driver? Is there a list of drivers that do not
>>     support 3.2
>>      >> I should tell them to avoid? Anything else come to mind?
>>      >>
>>      >> I just want to try to provide a bit more help to folks to get
>>     them up and
>>      >> running with Mesa and even better get our code to handle it
>>     automatically if
>>      >> we could.
>>      >>
>>      >> Any pointers appreciated. The application is vtk.
>>      >>
>>      >> Thanks
>>      >> Ken
>>      >>
>>      >>
>>      >>
>>      >>
>>      >>
>>      >>
>>      >>
>>      >> --
>>      >> Ken Martin PhD
>>      >> Chairman & CFO
>>      >> Kitware Inc.
>>      >> 28 Corporate Drive
>>      >> Clifton Park NY 12065
>>      >> 518 371 3971 <tel:518%20371%203971>
>>      >>
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>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.freedesktop.org_mailman_listinfo_mesa-2Dusers&d=BQMFaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=T0t4QG7chq2ZwJo6wilkFznRSFy-8uDKartPGbomVj8&m=DgUiZLZLE5l5BuSC2NBUMBQS2DGA9QhpHNlB-VsdiFA&s=GUHRuxZw-TCs8qGxwpn4d6zy7Et2yH5D2dq7lVdtxR8&e=>
>>      >>
>>      > Not all mesa drivers support gl 3.2, e.g. the r300 gallium driver
>> in
>>      > the git mesa supports only glsl 1.20:
>>      >         case PIPE_CAP_GLSL_FEATURE_LEVEL:
>>      >             return 120;
>>      >
>>      > That website is based on gl3.txt. It does not list all drivers mesa
>>      > supports (as gl3.txt dosen't). They are both only meant to be a
>> rough
>>      > guide. The svga driver apparently supports gl 3.3 and it isn't even
>>      > mentioned in gl3.txt. So I think some of the vtk users have
>>     really old
>>      > gpus that don't support gl 3.2. Some gl versions already have
>>     software
>>      > emulated components for gl features not supported by the hardware
>> on
>>      > older gpus and some older gpus simply don't have support.
>>     As those environment variables you use simply fake the gl version to
>>     the application. If the application then uses say a gl 3.2 feature
>>     that isn't supported by that driver, the behavior is undefined (e.g.
>>     application can crash).
>>
>>
>>
>>
>> --
>> Ken Martin PhD
>> Chairman & CFO
>> Kitware Inc.
>> 28 Corporate Drive
>> Clifton Park NY 12065
>> 518 371 3971
>>
>> This communication, including all attachments, contains confidential and
>> legally privileged information, and it is intended only for the use of
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>> you are not the intended recipient, any disclosure, copying,
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>> be unlawful. If you received this communication in error please notify
>> us immediately and destroy the original message. Thank you.
>>
>>
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